/* Extracted styles from index.html */
body {
  font-family: "Segoe UI", "Noto Sans JP", Arial, sans-serif;
  background: #f7f7f7;
  color: #222;
  margin: 0;
  padding: 0;
}
header {
  background: #607d8b;
  color: #fff;
  padding: 2rem 1rem 1rem 1rem;
  text-align: center;
}
header h1 {
  margin: 0 0 0.5em 0;
  font-size: 2.2rem;
  letter-spacing: 0.1em;
}

header a {
  text-decoration: none;
  color: inherit;
}

header a:hover h1 {
  opacity: 0.8;
}
nav {
  margin: 1em 0;
  text-align: center;
}
nav a {
  color: #fff;
  background: #78909c;
  text-decoration: none;
  margin: 0 0.5em;
  padding: 0.5em 1em;
  border-radius: 4px;
  transition: background 0.2s;
  font-size: 1rem;
}
nav a:hover {
  background: #455a64;
}
main {
  max-width: 700px;
  margin: 2em auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  padding: 2em 1.5em;
}
h2 {
  color: #607d8b;
  border-bottom: 1px solid #eee;
  padding-bottom: 0.3em;
  margin-top: 1.5em;
}
ul {
  padding-left: 1.2em;
}
li {
  margin-bottom: 0.7em;
  font-size: 1.05em;
}
a {
  color: #1976d2;
  text-decoration: underline;
}
a:hover {
  color: #0d47a1;
}
/* Card Grid Layout - Reusable for multiple pages */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  padding: 30px;
}

.card {
  background: #fafbfc;
  border: 1px solid #e1e4e8;
  border-radius: 6px;
  padding: 25px;
  transition: all 0.3s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
  border-color: #667eea;
}

.card-header {
  border-bottom: 2px solid #667eea;
  padding-bottom: 15px;
  margin-bottom: 15px;
}

.card-title {
  font-size: 1.3em;
  font-weight: 600;
  color: #667eea;
  margin-bottom: 5px;
}

.card-subtitle {
  font-size: 0.95em;
  color: #666;
  font-style: italic;
}

.card-content {
  font-size: 0.95em;
  line-height: 1.8;
}

.section {
  margin-bottom: 12px;
}

.section-title {
  font-weight: 600;
  color: #333;
  margin-bottom: 5px;
  padding-left: 10px;
  border-left: 3px solid #764ba2;
}

.section-item {
  margin: 8px 0 2px 0;
  padding-left: 5px;
  color: #333;
  line-height: 1.5;
  font-weight: 500;
  word-break: break-word;
}

.section-creator {
  margin: 0 0 12px 0;
  padding-left: 5px;
  color: #666;
  font-size: 0.9em;
  font-weight: 400;
}

.btn {
  display: inline-block;
  margin-top: 15px;
  padding: 8px 15px;
  background: #667eea;
  color: white;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.9em;
  transition: background 0.3s ease;
}

.btn:hover {
  background: #764ba2;
}

/* Container for card-based pages */
.page-container {
  max-width: 1000px;
  margin: 0 auto;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

/* Page header with gradient */
.page-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 40px 30px;
  text-align: center;
}

.page-header h1 {
  font-size: 2.5em;
  margin-bottom: 10px;
  font-weight: 300;
  letter-spacing: 2px;
}

.page-header p {
  font-size: 1.1em;
  opacity: 0.95;
  margin-bottom: 5px;
}

.page-header .subtitle {
  font-size: 0.95em;
  opacity: 0.85;
  font-style: italic;
}

.page-footer {
  background: #f0f2f5;
  padding: 20px;
  text-align: center;
  border-top: 1px solid #e1e4e8;
  color: #666;
  font-size: 0.9em;
}

/* Background gradient for page body */
body.gradient-bg {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

@media (max-width: 768px) {
  .page-header h1 {
    font-size: 1.8em;
  }

  .card-grid {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .card {
    padding: 20px;
  }
}

@media (max-width: 600px) {
  main {
    padding: 1em 0.5em;
  }
  header h1 {
    font-size: 1.3rem;
  }
}